Administrator Guide

Access Control Lists 641
Figure 20-3 lists commonly-used IP protocol numbers:
Using IP and MAC Address Masks
Masks are used with IP and MAC addresses to specify what should be
considered in the address for a match. Masks are expanded internally into a
bit mask and are applied bit-wise in the hardware even though they are
entered in decimal or hexadecimal format. Masks need not have contiguous 0
or 1 bits. A 0 bit value in the mask indicates that the address field in the
packet being compared must match the address bit exactly. A 1 value in the
mask indicates a wildcard or don't care value, i.e. the access bits are not
compared and match any possible value. For example, an IP address of 3.3.3.3
with a mask of 0.0.0.0 indicates that the ACL matches on all four bytes of the
0x8808 MAC Control
0x8809 Slow Protocols (IEEE 802.3)
0x8870 Jumbo frames
0x888E EAP over LAN (EAPOL – 802.1x)
0x88CC Link Layer Discovery Protocol
0x8906 Fibre Channel over Ethernet
0x9100 Q in Q
Table 20-3. Common IP Protocol Numbers
IP Protocol Number Protocol
0x00 IPv6 Hop-by-hop option
0x01 ICMP
0x02 IGMP
0x06 TCP
0x08 EGP
0x09 IGP
0x11 UDP
Table 20-2. Common EtherType Numbers (Continued)
EtherType Protocol